The most simple explanation:
Humans dont need it either.
Ofc. this isnt exactly true, as the top comment says, even animals can get sunburnt, but animals either have the skintype to protect against sunlight or they also hide from the sun.
Ask any wildlife photographer when they shoot animals, all of them will say either morning or evening and thats not because of the nice lighting only.
At full sunlight most animals search shelter from the sun.
Same with humans, we got shelter 24/7 if we want, thats why our skin became so sensitive.
If you would gradually expose your skin to sun, you would get more brown because your body produces melanin, a pigment that protects your skin cells from being penetrated by UV-light.
this aswell has limits, but you can go way longer without the uv causing damage that causes cancer etc.
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